<!DOCTYPE html>
<html lang="zh-CN">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Demo</title>
    <link rel="stylesheet" href="style.css">
</head>

<body>
    <button class="green">CSS button!</button>
    <button class="blue">CSS 光影按钮</button>
</body>

</html>